Bi-ventricular percutaneous cable

ABSTRACT

A percutaneous cable includes a cable body having a first end and second end, the cable body including a sheath adapted to traverse a patient&#39;s skin. The cable includes a plurality of conductors disposed within the cable body configured to transmit power and control data between a system controller and two implantable pumps. The cable includes a first connector disposed at the first end of the cable body and coupled to the plurality of conductors, the first connector configured to connect the cable body to the system controller. The cable includes a second connector disposed at the second end of the cable body, the second connector comprising a first set of contacts and a second set of contacts.

CROSS-REFERENCE TO RELATED APPLICATION

This application claims priority from U.S. Provisional Application No.61/352,087, filed Jun. 7, 2010, and titled “BI-VENTRICULAR PERCUTANEOUSCABLE,” which is incorporated by reference.

TECHNICAL FIELD

This disclosure relates to a percutaneous cable for mechanicalcirculatory cardiac assist devices.

BACKGROUND

Heart assist devices or pumps can be inserted in the circulatory systemto pump blood from the ventricle to the vasculature. Such a pump isknown as a ventricular assist device, or VAD. A VAD is useful when theventricle alone is incapable of providing adequate blood flow.

Two implantable VADs, each with associated pump control equipment, havetypically been used to provide bi-ventricular support for heart failurepatients.

SUMMARY

Rather than requiring two sets of pump control equipment to control twoVADs, a single integrated percutaneous cable simultaneously andindependently transmits power and control data between, for example, auniversal system controller positioned outside a human body, and twoimplanted VADs. The single integrated percutaneous cable controls thetwo implanted VADs independently, without the need for two sets ofsystem drivers, percutaneous cables, and power management components.Use of a single percutaneous cable further eliminates at least oneincision and entry point into the human body, which reduces a patient'scable and wound management burdens.

In a general aspect, a percutaneous cable includes a cable body having afirst end and a second end. The cable body includes a sheath adapted totraverse a patient's skin. The cable includes a plurality of conductorsdisposed within the cable body configured to transmit power and controldata between a system controller and two implantable pumps. The cablealso includes a first connector disposed at the first end of the cablebody and coupled to the plurality of conductors, the first connectorconfigured to connect the cable body to the system controller, and asecond connector disposed at the second end of the cable body. Thesecond connector includes a first set of contacts and a second set ofcontacts, the first set of contacts coupled to a first portion of theplurality of conductors and adapted to electrically connect the firstportion of the plurality of conductors to a first of the two implantablepumps and the second set of contacts coupled to a second portion of theplurality of conductors and adapted to electrically connect the secondportion of the plurality of conductors to a second of the twoimplantable pumps. The second connector includes a first end that has aninner surface, the inner surface of the first end being configured tointeract with respective sealing members of a first pump cable when thefirst pump cable is coupled to the first end of the second connector.The second connector includes a second end having an inner surface, theinner surface of the second end being configured to interact withrespective sealing members of a second pump cable when the second pumpcable is coupled to the second end of the second connector.

Implementations may include one or more of the following features. Forexample, the second connector is made from a biocompatible material andis implantable beneath the skin. The first end of the second connectorincludes a threaded outer surface that is configured to mate with aninner threaded surface of a first screw ring surrounding at least a partof the first pump cable, and the second end of the second connectorincludes a threaded outer surface that is configured to mate with aninner threaded surface of a second screw ring surrounding at least apart of the second pump cable. The sealing members include o-rings. Theinner surface of the first end includes two portions having differentdiameters, and the inner surface of the second end includes two portionshaving different diameters. The first portion of the plurality ofconductors are hard wired to the first set of contacts and the first setof contacts includes a plurality of receptacles configured to receivemating pins of a first pump cable when the first pump cable is coupledto the first end of the second connector, and the second portion of theplurality of conductors are hard wired to the second set of contacts andthe second set of contacts includes a plurality of receptaclesconfigured to receive mating pins of a second pump cable when the secondpump cable is coupled to the second end of the second connector. Thesecond connector further includes a first end having a threaded outersurface and an inner surface, the inner surface of the first end beingconfigured to interact with respective sealing members of a first pumpcable when the first pump cable is coupled to the first end of thesecond connector, and a second end coupled to a second pump cable.

In another aspect, an implantable connector includes a housing made froma biocompatible material. The housing includes a first connector havinga threaded outer surface and an inner surface having a first diameterand a second diameter less than the first diameter. The inner surface ofthe first connector is configured to interact with respective sealingmembers of a percutaneous cable when the percutaneous cable is coupledto the first connector. The percutaneous cable includes a first set ofconductors for transmitting power and control data between a controllerand two implantable pumps. The housing includes a second connectorhaving a threaded outer surface and an inner surface having a firstdiameter and a second diameter less than the first diameter. The innersurface of the second connector is configured to interact withrespective sealing members of a first pump cable when the first pumpcable is coupled to the second connector. The first pump cable includesa second set of conductors for transmitting power and control databetween the controller and a first of the two implantable pumps. Thehousing includes a third connector having a threaded outer surface andan inner surface having a first diameter and a second diameter less thanthe first diameter. The inner surface of the third connector isconfigured to interact with respective sealing members of a second pumpcable when the second pump cable is coupled to the third connector. Thesecond pump cable includes a third set of conductors for transmittingpower and control data between the controller and a second of the twoimplantable pumps. The housing includes a first contact block disposedwithin the first connector, the first contact block including aplurality of electrical contacts that are configured to connect to thefirst set of conductors in the percutaneous cable when the percutaneouscable is coupled to the first connector. The housing includes a secondcontact block disposed within the second connector, the second contactblock including a plurality of electrical contacts that are connected toa first portion of the contacts of the first contact block and areconfigured to connect to the second set of conductors in the first pumpcable when the first pump cable is coupled to the second connector. Thehousing includes a third contact block disposed within the thirdconnector, the third contact block including a plurality of electricalcontacts that are connected to a second portion of the contacts of thefirst contact block and are configured to connect to the third set ofconductors in the second pump cable when the second pump cable iscoupled to the third connector.

Implementations may include one or more of the following features. Forexample, the threaded outer surface of the first connector is configuredto mate with an inner threaded surface of a first screw ring surroundingat least a part of the percutaneous cable. The threaded outer surface ofthe second connector is configured to mate with an inner threadedsurface of a second screw ring surrounding at least a part of the firstpump cable, and the threaded outer surface of the first connector isconfigured to mate with an inner threaded surface of a third screw ringsurrounding at least a part of the second pump cable. The electricalcontacts of the second contact block are hard wired to the first portionof the contacts of the first contact block and the electrical contactsof the third contact block are hard wired to the second portion of thecontacts of the first contact block. The first, second, and thirdcontact blocks each include a plurality of receptacles configured toreceive mating pins of the percutaneous cable, first pump cable, andsecond pump cable, respectively.

In another general aspect, a method includes transmitting power andcontrol data from a controller through a plurality of conductors of apercutaneous cable, bifurcating the power and control data from theplurality of conductors of the percutaneous cable onto a first set ofconductors and a second set of conductors via a connector implanted witha body, transmitting power and control data through the first set ofconductors to a first pump cable connected to a first of two implantedventricular assist pumps, and transmitting power and control datathrough the second set of conductors to a second pump cable connected toa second of the two implantable ventricular assist pumps.

Implementations may include one or more of the following features. Forexample, the percutaneous cable includes a biocompatible sheath that isadapted to traverse skin. The percutaneous cable traverses skin and isreleasably connected to the connector implanted within the body. One ofthe first and second pump cables is releasably connected to theconnector and the other of the first and second pump cables ispermanently connected to the connector. The method can also includecoupling a second connector between the percutaneous cable and thecontroller.

The details of one or more embodiments of the invention are set forth inthe accompanying drawings and the description below. Other features,objects, and advantages of the invention will be apparent from thedescription and drawings, and from the claims.

DESCRIPTION OF DRAWINGS

FIG. 1 illustrates a percutaneous cable and connector assembly disposedwithin a body.

FIG. 2 is a cross-sectional view of an implementation of thepercutaneous cable.

FIG. 3 illustrates a detailed exploded view of a connection between abifurcated connector and an implantable pump cable.

FIG. 4 is a cross-sectional view of the bifurcated connector of FIG. 3.

FIG. 5 illustrates an alternative implementation of the percutaneouscable and bifurcated connector, and an exemplary connection between thepercutaneous cable, bifurcated connector, and implantable pump cables.

FIG. 6 is a cross-sectional view of the bifurcated connector of FIG. 5.

Like reference symbols in the various drawings indicate like elements.

DETAILED DESCRIPTION

Referring to FIG. 1, a single integrated percutaneous lead or cable 10that is part of a heart assist system 100 includes a cable body 11, aconnector 30 at an end 14 for coupling the cable 10 to a systemcontroller 40, and a bifurcated connector 50 at an end 12 for couplingthe cable 10 to two ventricular assist devices (VADs) 60, 70 via twocables 65, 75, respectively. In use, the cable 10 extends through apatient's skin with a region 12 a of the cable 10 located internal tothe patient's body 20, a region 14 a of the cable 10 located external tothe body 20, and a portion 16 extending through a single incision in theskin.

Referring to FIGS. 1 and 2, the cable 10 includes a number of conductorsor wires 80 surrounded by a conductor wrap 13. The cable 10 alsoincludes a sheath 15 formed around the conductor wrap 13. The sheath 15is made from a material that is resistant to fluid penetration throughthe material. The cable 10 includes a total of twelve conductors 80,which can be, for example, further divided into two, six-conductorbundles 82, 84. Bundles 82, 84 transmit power and control data betweenthe system controller 40 and the implanted VADs 60, 70, as will bedescribed in further detail below. The conductor wrap 13 and sheath 15are made from a flexible material and extend along the entire length ofthe conductors 80. In addition to being resistant to fluid penetration,the sheath 15 may be formed from a biocompatible material along at leasta portion of its length, and particularly, along the length of thesheath 15 that will be implanted in the body or come into contact withthe skin.

The connector 30 includes a number of conductive elements 32 (FIG. 1),e.g., in the form of pins or receptacles, that mate with correspondingelements (not shown) on the system controller 40. An exemplary systemcontroller for use with the present disclosure is described inco-pending U.S. Application Ser. No. 61/366,757, filed Jul. 22, 2010,the entirety of which is incorporated herein by reference. Theconductive elements 32 are also connected to the conductors 80 withincable 30 in order to transmit the power and control data from the systemcontroller 40 to the conductors 80. The conductive elements 32 areconnected to the conductors 80 by any known method, including soldering,welding, crimping, and contact and/or terminal attachments.

Referring now to FIGS. 1, 3, and 4, in use, the connector 50 includes aY-shaped housing 500 made from a biocompatible material. The housing 500is formed, e.g., as an overmolded projection of the cable 10, andincludes a strain relief portion 502 that extends along a portion of thecable 10 away from the housing 500. The strain relief 502 minimizes anyforces or stresses on conductors 80 as the cable 10 transitions from theflexible sheath 15 to the overmolded housing 500 of the connector 50.

The housing 500 includes at least two ends 504, 506 that are used tobifurcate or split the conductors 80 into the two conductor bundles 82,84 (a portion of which are shown in the cross-sectional view of FIG. 4).Each of the ends 504, 506 are connectable to pump cables 65, 75,respectively. The pump cables 65, 75 terminate at each respective bloodpump or VAD 60, 70. Specifically, each end 504, 506 includes externalthreads 508, 510, respectively, formed at an outer edge of the ends 504,506. Each of the external threads 508, 510 receives a mating thread (notshown) formed in a screw ring 650 that is rotatably connected about aconnector 656 of pump cables 65, 75. Only one of the screw ring 605 andconnector 656 are shown in FIG. 3 for simplicity. The screw ring 650permits the pump cables 65, 75 to be releasably connected to the housing500.

In order to provide a seal between the housing 500 and the mating pumpcables 65, 75 that limits or prevents fluid ingress, during use, theends 504, 506 include an inner surface 512, 514 that mates with sealingmembers 652, 654, such as double o-rings 652, 654, disposed onconnectors 656 of the pump cables 65, 75. Specifically, inner surface512 includes a first surface 512 a, defining a circular cross-sectionalarea having a diameter D1. Inner surface 512 includes a second surface512 b, defining a circular cross-sectional area having a diameter D2,which is less than D1. The first and second surfaces 512 a, 512 binteract with sealing member 652, 654, respectively, to provide afluid-tight seal between the housing 500 and pump cable 65 when the pumpcable 65 is secured to the housing 500 using, for example, the screwring 650. Similarly, inner surface 514 includes first and secondsurfaces 514 a and 514 b that interact with sealing members (not shown)formed on the corresponding connector (not shown) of pump cable 75.

As noted above, the housing 500 includes at least two ends 504, 506 thatare used to bifurcate or split the conductors 80 into the two conductorbundles 82, 84 (for simplicity, only three of the six conductors in eachof conductor bundles 82, 84 are shown in FIG. 4). To accommodate thisbifurcation, each end 504, 506 also includes a contact block 520, 530,respectively. Each of the contact blocks 520, 530 includes a set ofelectrical contacts 522, 532, respectively, that electrically connect toeach of the conductors in the conductor bundles 82, 84. For example,there are six conductors in each conductor bundle 82, 84, and sixcorresponding contacts 522, 532 in each contact block 520, 530, althoughany number of conductors and respective contacts may be used dependingon the implementation. The contact blocks 520, 530 also include a set ofreceptacles 524, 534, respectively, that receive and/or mate withcorresponding electrical contact pins (not shown) formed or disposed inthe end of connector 656 of the pump cables 65, 75 when the pump cables65, 75 are connected to the housing 500 as described above.

In use, the single percutaneous cable 10 transmits power and controldata between, for example, a universal controller, such as systemcontroller 40 and two implantable blood pumps, such as VADs 60, 70. Thecable 10 requires only one incision to be made in the skin of thepatient, which reduces the possibility for tissue infection and reducesthe complexity and amount of equipment the patient must use on a dailybasis. The implantable housing 500 provides for the bifurcation of theelectrical conductors from the single integrated percutaneous cable 10to a set of dedicated pump cables, such as cables 65, 75 which areconnected to the implanted VADs 60, 70. The sealing and connectionsbetween the pump cables 65, 75 and the bifurcated ends 504, 506 of thehousing 500 facilitate disconnecting the percutaneous lead 10 from theVADs 60, 70 for maintenance, cleaning, etc.

In an alternative implementation, instead of being formed as anovermolded projection of the cable 10, the connector 50 a of FIGS. 5 and6 includes a housing 500 a that is removably connectable to both thepercutaneous cable 10 as well as the pump cables 65, 75. The connectionsbetween the housing 500 a and the pump cables 65, 75 have been describedabove with reference to the implementation of FIGS. 3 and 4, andtherefore, for the sake of brevity will not be repeated here.

In addition to ends 504, 506, which were described above, the housing500 a includes an additional end 550, which connects to the percutaneouscable 10. In this example, the cable 10 includes a connector 700 that isconstructed in a similar manner to, for example, connector 656 of pumpcables 65, 75. In particular, the connector 700 includes a screw ring710 having internal threads (not shown) rotatably secured about theconnector 700 and a male connector socket 720 that includes a firstsection 722 having a cross-sectional area and a second section 724having a cross-sectional area that is larger than the cross-sectionalarea of the first section 722. Sections 722, 724 are preferablycircular, but other geometric shapes may be employed, such as square,rectangular, semicircular, etc. One exemplary purpose of a non-uniformgeometric shape is to ensure proper orientation of the connectors forelectrical connections. Alternately, the sections 722, 724 may employanother feature or element for ensuring proper electrical connections.Received in each of sections 722, 724 are sealing members, such as, forexample, o-rings 726, 728, respectively. The connector 700 includes aset of electrical contact pins (not shown) formed or disposed in the endof connector 700 of the percutaneous cable 10. The contact pins areconnected to the conductors 80 within the percutaneous cable 10 by anyknown method, including soldering, welding, crimping, or using anappropriate contact and/or terminal attachments. In this exemplaryimplementation, there are a total of, for example, twelve contact pins,each corresponding to the twelve conductors 80 disposed in thepercutaneous cable 10. The proximal end 12 of cable 10 includes a strainrelief portion 15 at the proximal end 12 of the cable 10. The strainrelief 15 minimizes any forces or stresses on conductors 80 as the cable10 transitions from the flexible sheath 15 to the connector 700.

The end 550 of the connector 50 a is releasably connected to theconnector 700 of the percutaneous cable 10. Specifically, the end 550includes external threads 552 formed at an outer edge of the end 550.The external threads 552 receive the internal threads (not shown) of thescrew ring 710 of the connector 700. In order to provide a seal betweenthe end 550 and the mating connector 700, the end 550 includes an innersurface 540 that mates with sealing members, such as the double o-rings726, 728. Specifically, inner surface 540 includes a first surface 540a, defining a circular cross-sectional area having a diameter D1, and asecond surface 540 b, defining a circular cross-sectional area having adiameter D2, which is smaller than D1. The first and second surfaces 540a, 540 b interact with sealing members 728, 726, respectively, toprovide a seal between the housing 500 a and percutaneous cable 10 whenthe percutaneous cable 10 is secured to the housing 500 a using, forexample, the screw ring 710.

In order to bifurcate or split the control and power data from therespective conductors 80 and transmit the control and power data to theappropriate implanted pump, along for example, pump cables 65, 75, theend 550 includes a contact block 560. The contact block 560 includes aset of receptacles 564 that receive and/or mate with the correspondingelectrical contact pins (not shown) formed or disposed in the end ofconnector 700 of the percutaneous cable 10 when the percutaneous cable10 is connected to the housing 500 a. In this particular example, thecontact block 560 includes twelve receptacles corresponding to thetwelve conductors 80 disposed in the percutaneous cable 10. Any numberof receptacles may be included in the contact block 560. The contactblock 560 further includes a set of electrical contacts 562, each ofwhich are connected to a number of conductors or wires 570 (a portion ofwhich are shown in FIG. 6). A portion of the conductors or wires 570 arelikewise connected to the contacts formed in each of the contact blocks520, 530 in order to bifurcate the power and control data and/or otherelectrical signals for the appropriate pump 60, 70. For example, in theexemplary implementation, twelve wires or conductors 80 are connected tothe contact block 560 of the housing 500 a via the connector 700 of thepercutaneous cable 10. Six wires or conductors 570 are connected betweenthe contact block 560 and the contact block 520 and six wires orconductors 570 are connected between the contact block 560 and thecontact block 530. In this manner, control, power, and/or otherelectrical information can be delivered through the single percutaneouscable 10, bifurcated within the connector 50 a and be transmitted to theappropriate implanted pump via, for example, the connected pump cables65, 75 as described above.

In use, the modularity of the bifurcated connector 50 a of FIGS. 5 and 6provides the user with the ability to change only the percutaneous lead,for example, in case the lead becomes unusable. This could beadvantageous given that the diameter of the cable in certainimplementations is smaller than the size of the bifurcated connector andtherefore may provide the ability to replace the cable with aless-intrusive operation.

The percutaneous lead 10 can additionally include other features thatreduce a user's possibility of infection and/or provide stabilization ofthe percutaneous lead 10 with respect to the body 20. As describedabove, an opening in the skin exposes tissue to infection. Additionally,movement of the portion 16 of the percutaneous lead 10 that traversesthe skin opening in relation to the skin opening itself can cause damageto tissue surrounding the percutaneous lead 10, thus increasing thepossibility of infection. The percutaneous lead can include featuresthat reduce movement of the internal portion of the percutaneous lead 10relative to the user. An exemplary system for reducing movement of thelead relative to the user and for use with the present disclosure isdescribed in co-pending U.S. Application Ser. No. 61/375,766, filed Aug.20, 2010, the entirety of which is incorporated herein by reference. Inaddition, as shown in FIG. 1, the percutaneous lead 10 can include astrain-relief portion 17 for anchoring the percutaneous lead 10 to theuser and for reducing the strain on the portion of the percutaneous leadexiting the user's body. Although the strain-relief portion 17 is shownon the outside of the body 20, an appropriate strain-relief portion maybe provided under the skin or elsewhere in the body.

A number of implementations have been described. Nevertheless, it willbe understood that various modifications may be made without departingfrom the spirit and scope of the disclosure. For example, while twelveconductors 80 have been shown disposed in the percutaneous cable 10 andleading from the system controller 40, and six conductors in each of thepump cables 65, 75, it will be apparent that more or less conductors maybe employed depending on the power and control characteristics of theheart assist devices to be controlled. In addition, although the cable10 has been described as being divided into two, six-conductor bundles82, 84, any number of suitable bundles may be employed. Further,although bundles 82, 84 have been described as transmitting power andcontrol data between the system controller 40 and the implanted VADs 60,70, the cables/bundles can be used for other types of electrical signaltransmission. In addition, although the conductor wrap 13 and sheath 15have been described as extending along the entire length of theconductors 80, other implementations may include the conductor wrap 13or the sheath 15 extending along a portion, but not all, of the lengthof the conductors.

In addition, although the screw rings 650, 710 have been described asthe means of coupling the various cables to the implantable bifurcatedhousing, other connectors may be used. Examples of such connectors mayinclude twist-and-lock connectors, connectors with bolted flanges,compressive fittings, or other threaded connections. Further, the screwrings may also be provided with appropriate locking features thatprevent them from loosening during use. In addition, although sealingmembers have been described as double o-rings 652 or o-rings 726, 728,other sealing devices may be used. Examples of such sealing members mayinclude chevron seals, u-cups, diaphragms, discs, sleeves, or othersuitable elastomeric, metallic, or plastic seals.

Further, although the implementations have been described as employing asingle bifurcated implantable connector, the system can also employ anexternal bifurcated connector to allow, for example, two separate systemcontrollers to be used. This may allow for less complex systemcontrollers to be employed even though the number of controllers isincreased. In addition, the bifurcated connector may be made from anon-biocompatible material, in which case, the connector would bedisposed outside of the patient's body. Such a connector may be madefrom, for example, less expensive materials, and perhaps would notrequire the same fluid-tight fittings and arrangements as describedabove, however, such a connector may require the use of two incisions inthe body for the passage of two pump cables. In another implementation,instead of having two ends or passageways 508, 510 connectable to pumpcables, such as pump cables 65, 75, one of the ends or passageways maybe permanently connected to one of the pump cables.

Further, although, for example, the inner surfaces of the ends orpathways 504, 506 and 550 of the bifurcated connector housing have beendescribed as defining circular cross-sectional area, other geometricshapes are possible, including, for example, square, rectangular,semicircular, or other suitable shapes. Further, while the connector 50has been described as including a Y-shaped housing 500 made from abiocompatible material, the housing can be any suitable shape, such as,for example, X-shaped if the cable needs, for example, to be in abifurcated configuration for electrically coupling to two differentdevices (e.g., power source and controller are separate).

In addition, the connector 30 may include a cap (not shown) used toprotect the external physical structure of the distal end 14 and theconnector 30, as well as the exposed metal conductive elements 32 thatcan be coupled to the system controller 40. In some implementations,this cap can be designed to be fluid resistant or fluid proof. In otherimplementations, the cap can prevent moisture from seeping into theconnector and reaching the metal connections. The cap can also limit anyelectrical conduction from any outside element with the metalconnections.

The various parts of the system may be constructed from any appropriateand adequately durable materials. For example, the connectors and otherstructural components may be made from titanium or titanium alloy,stainless steel, or a plastic of appropriate strength that is capable oflong-term implantability and sterilization, as necessary.

Accordingly, other embodiments are within the scope of the followingclaims.

1. A percutaneous cable comprising: a cable body having a first end andsecond end, the cable body comprising a sheath adapted to traverse apatient's skin; a plurality of conductors disposed within the cable bodyconfigured to transmit power and control data between a systemcontroller and two implantable pumps; a first connector disposed at thefirst end of the cable body and coupled to the plurality of conductors,the first connector configured to connect the cable body to the systemcontroller; and a second connector disposed at the second end of thecable body, the second connector comprising: a first set of contacts anda second set of contacts, the first set of contacts coupled to a firstportion of the plurality of conductors and adapted to electricallyconnect the first portion of the plurality of conductors to a first ofthe two implantable pumps and the second set of contacts coupled to asecond portion of the plurality of conductors and adapted toelectrically connect the second portion of the plurality of conductorsto a second of the two implantable pumps, a first end having an innersurface, the inner surface of the first end being configured to interactwith respective sealing members of a first pump cable when the firstpump cable is coupled to the first end of the second connector, and asecond end having an inner surface, the inner surface of the second endbeing configured to interact with respective sealing members of a secondpump cable when the second pump cable is coupled to the second end ofthe second connector.
 2. The cable of claim 1, wherein the secondconnector is made from a biocompatible material and is implantablebeneath the skin.
 3. The cable of claim 1, wherein the first end of thesecond connector comprises a threaded outer surface that is configuredto mate with an inner threaded surface of a first screw ring surroundingat least a part of the first pump cable, and wherein the second end ofthe second connector comprises a threaded outer surface that isconfigured to mate with an inner threaded surface of a second screw ringsurrounding at least a part of the second pump cable.
 4. The cable ofclaim 1, wherein the sealing members comprise o-rings.
 5. The cable ofclaim 1, wherein the inner surface of the first end comprises twoportions having different diameters, and the inner surface of the secondend comprises two portions having different diameters.
 6. The cable ofclaim 1, wherein the first portion of the plurality of conductors arehard wired to the first set of contacts and the first set of contactscomprises a plurality of receptacles configured to receive mating pinsof a first pump cable when the first pump cable is coupled to the firstend of the second connector, and wherein the second portion of theplurality of conductors are hard wired to the second set of contacts andthe second set of contacts comprises a plurality of receptaclesconfigured to receive mating pins of a second pump cable when the secondpump cable is coupled to the second end of the second connector.
 7. Thecable of claim 1, wherein the second connector further comprises: afirst end having a threaded outer surface and an inner surface, theinner surface of the first end being configured to interact withrespective sealing members of a first pump cable when the first pumpcable is coupled to the first end of the second connector; and a secondend coupled to a second pump cable.
 8. An implantable connectorcomprising: a housing made from a biocompatible material, the housingcomprising: a first connector having a threaded outer surface and aninner surface having a first diameter and a second diameter less thanthe first diameter, the inner surface of the first connector configuredto interact with respective sealing members of a percutaneous cable whenthe percutaneous cable is coupled to the first connector, thepercutaneous cable comprising a first set of conductors for transmittingpower and control data between a controller and two implantable pumps; asecond connector having a threaded outer surface and an inner surfacehaving a first diameter and a second diameter less than the firstdiameter, the inner surface of the second connector configured tointeract with respective sealing members of a first pump cable when thefirst pump cable is coupled to the second connector, the first pumpcable comprising a second set of conductors for transmitting power andcontrol data between the controller and a first of the two implantablepumps; a third connector having a threaded outer surface and an innersurface having a first diameter and a second diameter less than thefirst diameter, the inner surface of the third connector configured tointeract with respective sealing members of a second pump cable when thesecond pump cable is coupled to the third connector, the second pumpcable comprising a third set of conductors for transmitting power andcontrol data between the controller and a second of the two implantablepumps; a first contact block disposed within the first connector, thefirst contact block comprising a plurality of electrical contacts thatare configured to connect to the first set of conductors in thepercutaneous cable when the percutaneous cable is coupled to the firstconnector; a second contact block disposed within the second connector,the second contact block comprising a plurality of electrical contactsthat are connected to a first portion of the contacts of the firstcontact block and are configured to connect to the second set ofconductors in the first pump cable when the first pump cable is coupledto the second connector; and a third contact block disposed within thethird connector, the third contact block comprising a plurality ofelectrical contacts that are connected to a second portion of thecontacts of the first contact block and are configured to connect to thethird set of conductors in the second pump cable when the second pumpcable is coupled to the third connector.
 9. The connector of claim 8,wherein the threaded outer surface of the first connector is configuredto mate with an inner threaded surface of a first screw ring surroundingat least a part of the percutaneous cable, the threaded outer surface ofthe second connector is configured to mate with an inner threadedsurface of a second screw ring surrounding at least a part of the firstpump cable, and the threaded outer surface of the first connector isconfigured to mate with an inner threaded surface of a third screw ringsurrounding at least a part of the second pump cable.
 10. The connectorof claim 8, wherein the electrical contacts of the second contact blockare hard wired to the first portion of the contacts of the first contactblock and the electrical contacts of the third contact block are hardwired to the second portion of the contacts of the first contact block.11. The connector of claim 8, wherein the first, second, and thirdcontact blocks each comprise a plurality of receptacles configured toreceive mating pins of the percutaneous cable, first pump cable, andsecond pump cable, respectively.
 12. A method comprising: transmittingpower and control data from a controller through a plurality ofconductors of a percutaneous cable; bifurcating the power and controldata from the plurality of conductors of the percutaneous cable onto afirst set of conductors and a second set of conductors via a connectorimplanted with a body; transmitting power and control data through thefirst set of conductors to a first pump cable connected to a first oftwo implanted ventricular assist pumps; and transmitting power andcontrol data through the second set of conductors to a second pump cableconnected to a second of the two implantable ventricular assist pumps.13. The method of claim 12, wherein the percutaneous cable comprises abiocompatible sheath that is adapted to traverse skin.
 14. The method ofclaim 12, wherein the percutaneous cable traverses skin and isreleasably connected to the connector implanted within the body.
 15. Themethod of claim 12, wherein one of the first and second pump cables isreleasably connected to the connector and the other of the first andsecond pump cables is permanently connected to the connector.
 16. Themethod of claim 12, further comprising coupling a second connectorbetween the percutaneous cable and the controller.